This topic is a complex one, but a few pointers will help you begin to learn about the diversity of language in Latin America despite the homogeneous face it may project due to the prevalence of Spanish.
One way is to surf the web. Explore the cultural terrain. The Latin American News and Information Center, or LANIC, is a great resource to begin with. Through links in the References section at the end of this article, you can find information about festivals, tips about the local culture and more. You can often find some webpages with e-mail addresses of webmasters or other authorities on different subjects.
For example, the SINIC webpage (also known in Spanish as Sistema Nacional de Información Cultural, or National System of Cultural Information) is the Colombian Government webpage that reveals, with their user-friendly menu, the wonderful and diverse cultural aspects of Colombia. Not only can one learn of the different dialects and indigenous languages still spoken in Colombia, but also about traditions, cuisine, dance festivals, music and details about daily life. Websites like SINIC give valuable information to would-be entrepreneurs about where to go and how to expand their businesses. In this way, the Colombian government, like others, uses virtual resources to attract business. One enterprise at the vanguard of attracting markets due to its cross-cultural focus is tourism, because it lets the world know what a country may have to offer to international markets.
As a Latin American journalist, I can suggest with confidence that the national newspapers, which often are published in English and other languages, are the best sources for learning about the social landscape and discovering if it is a business friendly environment.